The sun is a giant nuclear fusion reactor, converting hydrogen into helium and releasing massive amounts of energy in the form of heat – and sound. Sound is essentially vibration and needs a medium to travel through.
生活自理能力比知识储备更重要：能自己上厕所、吃饭、表达需求，是入园最坚实的底气。
，这一点在夫子中也有详细论述
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